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Mineralpedia Details for Marcasite

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Marcasite

Marcasite

Name is of Arabic or Moorish origin and was applied to pyrite and other minerals of similar color and/or luster. Marcasite is a common mineral and is widespread with thousands of localities worldwide. It occurs under highly acidic, but low temperature conditions in sedimentary and hydrothermal environments.

Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/marcasite.pdf

Formula
FeS2 
Crystal System
Orthorhombic 
Crystal Habit
Tabular, Stalactitic, Globular 
Cleavage
Indistinct, None, None 
Luster
Metallic 
Color
bronze, light brass yellow, tin white 
Streak
gray brownish black 
Class
Orthorhombic - Dipyramidal 
Fracture
Uneven 
Hardness
6-6.5 
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Marcasite from Komořany, Most, Ústí, Bohemia, Czech Republic

Marcasite
            from Komořany, Most, Ústí, Bohemia, Czech Republic

Brassy, cockscomb habit crystals to over 1.5cm.

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Marcasite from Joplin dist., Jasper Co., Missouri, United States

Marcasite
            from Joplin dist., Jasper Co., Missouri, United States

Brassy yellow Marcasite crystals with a curved, pineapple-like habit.

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Marcasite from Brushy Creek mine, Reynolds Co., Missouri, United States

Marcasite
            from Brushy Creek mine, Reynolds Co., Missouri, United States

Sparkly and iridescent Marcasite preferentially encrusting Calcite.

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Marcasite from Mineral Point, Iowa Co., Wisconsin, United States

Marcasite
            from Mineral Point, Iowa Co., Wisconsin, United States

Specimens from this area are hard to find these days. This one is well-preserved and clean with crystals from 3 to 15mm. 

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Marcasite from Elk Creek, Meade Co., South Dakota, United States

Marcasite
            from Elk Creek, Meade Co., South Dakota, United States

Interesting worm-like formations of Marcasite up to 1.7cm on yellow Calcite.

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